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w in (-oo:+oo)
-(7*w)-10 = 2*w+35 // - 2*w+35
-(7*w)-(2*w)-35-10 = 0
-7*w-2*w-35-10 = 0
-9*w-45 = 0 // + 45
-9*w = 45 // : -9
w = 45/(-9)
w = -5
w = -5
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